Järjestelmäviesti:Gadget-wordcloud2.js
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/*!
* wordcloud2.js
* http://timdream.org/wordcloud2.js/
*
* Copyright 2011 - 2013 Tim Chien
* Released under the MIT license
*/
'use strict';
// setImmediate
if (!window.setImmediate) {
window.setImmediate = (function setupSetImmediate() {
return window.msSetImmediate ||
window.webkitSetImmediate ||
window.mozSetImmediate ||
window.oSetImmediate ||
(function setupSetZeroTimeout() {
if (!window.postMessage || !window.addEventListener) {
return null;
}
var callbacks = [undefined];
var message = 'zero-timeout-message';
// Like setTimeout, but only takes a function argument. There's
// no time argument (always zero) and no arguments (you have to
// use a closure).
var setZeroTimeout = function setZeroTimeout(callback) {
var id = callbacks.length;
callbacks.push(callback);
window.postMessage(message + id.toString(36), '*');
return id;
};
window.addEventListener('message', function setZeroTimeoutMessage(evt) {
// Skipping checking event source, retarded IE confused this window
// object with another in the presence of iframe
if (typeof evt.data !== 'string' ||
evt.data.substr(0, message.length) !== message/* ||
evt.source !== window */) {
return;
}
evt.stopImmediatePropagation();
var id = parseInt(evt.data.substr(message.length), 36);
if (!callbacks[id]) {
return;
}
callbacks[id]();
callbacks[id] = undefined;
}, true);
/* specify clearImmediate() here since we need the scope */
window.clearImmediate = function clearZeroTimeout(id) {
if (!callbacks[id]) {
return;
}
callbacks[id] = undefined;
};
return setZeroTimeout;
})() ||
// fallback
function setImmediateFallback(fn) {
window.setTimeout(fn, 0);
};
})();
}
if (!window.clearImmediate) {
window.clearImmediate = (function setupClearImmediate() {
return window.msClearImmediate ||
window.webkitClearImmediate ||
window.mozClearImmediate ||
window.oClearImmediate ||
// "clearZeroTimeout" is implement on the previous block ||
// fallback
function clearImmediateFallback(timer) {
window.clearTimeout(timer);
};
})();
}
(function(global) {
// Check if WordCloud can run on this browser
var isSupported = (function isSupported() {
var canvas = document.createElement('canvas');
if (!canvas || !canvas.getContext) {
return false;
}
var ctx = canvas.getContext('2d');
if (!ctx.getImageData) {
return false;
}
if (!ctx.fillText) {
return false;
}
if (!Array.prototype.some) {
return false;
}
if (!Array.prototype.push) {
return false;
}
return true;
}());
// Find out if the browser impose minium font size by
// drawing small texts on a canvas and measure it's width.
var miniumFontSize = (function getMiniumFontSize() {
if (!isSupported) {
return;
}
var ctx = document.createElement('canvas').getContext('2d');
// start from 20
var size = 20;
// two sizes to measure
var hanWidth, mWidth;
while (size) {
ctx.font = size.toString(10) + 'px sans-serif';
if ((ctx.measureText('\uFF37').width === hanWidth) &&
(ctx.measureText('m').width) === mWidth) {
return (size + 1);
}
hanWidth = ctx.measureText('\uFF37').width;
mWidth = ctx.measureText('m').width;
size--;
}
return 0;
})();
// Based on http://jsfromhell.com/array/shuffle
var shuffleArray = function shuffleArray(arr) {
for (var j, x, i = arr.length; i;
j = Math.floor(Math.random() * i),
x = arr[--i], arr[i] = arr[j],
arr[j] = x) {}
return arr;
};
var WordCloud = function WordCloud(elements, options) {
if (!isSupported) {
return;
}
if (!Array.isArray(elements)) {
elements = [elements];
}
elements.forEach(function(el, i) {
if (typeof el === 'string') {
elements[i] = document.getElementById(el);
if (!elements[i]) {
throw 'The element id specified is not found.';
}
} else if (!el.tagName && !el.appendChild) {
throw 'You must pass valid HTML elements, or ID of the element.';
}
});
/* Default values to be overwritten by options object */
var settings = {
list: [],
fontFamily: '"Trebuchet MS", "Heiti TC", "微軟正黑體", ' +
'"Arial Unicode MS", "Droid Fallback Sans", sans-serif',
fontWeight: 'normal',
color: 'random-dark',
minSize: 0, // 0 to disable
weightFactor: 1,
clearCanvas: true,
backgroundColor: '#fff', // opaque white = rgba(255, 255, 255, 1)
gridSize: 8,
origin: null,
drawMask: false,
maskColor: 'rgba(255,0,0,0.3)',
maskGapWidth: 0.3,
wait: 0,
abortThreshold: 0, // disabled
abort: function noop() {},
minRotation: - Math.PI / 2,
maxRotation: Math.PI / 2,
shuffle: true,
rotateRatio: 0.1,
shape: 'circle',
ellipticity: 0.65,
hover: null,
click: null
};
if (options) {
for (var key in options) {
if (key in settings) {
settings[key] = options[key];
}
}
}
/* Convert weightFactor into a function */
if (typeof settings.weightFactor !== 'function') {
var factor = settings.weightFactor;
settings.weightFactor = function weightFactor(pt) {
return pt * factor; //in px
};
}
/* Convert shape into a function */
if (typeof settings.shape !== 'function') {
switch (settings.shape) {
case 'circle':
/* falls through */
default:
// 'circle' is the default and a shortcut in the code loop.
settings.shape = 'circle';
break;
case 'cardioid':
settings.shape = function shapeCardioid(theta) {
return 1 - Math.sin(theta);
};
break;
/*
To work out an X-gon, one has to calculate "m",
where 1/(cos(2*PI/X)+m*sin(2*PI/X)) = 1/(cos(0)+m*sin(0))
http://www.wolframalpha.com/input/?i=1%2F%28cos%282*PI%2FX%29%2Bm*sin%28
2*PI%2FX%29%29+%3D+1%2F%28cos%280%29%2Bm*sin%280%29%29
Copy the solution into polar equation r = 1/(cos(t') + m*sin(t'))
where t' equals to mod(t, 2PI/X);
*/
case 'diamond':
case 'square':
// http://www.wolframalpha.com/input/?i=plot+r+%3D+1%2F%28cos%28mod+
// %28t%2C+PI%2F2%29%29%2Bsin%28mod+%28t%2C+PI%2F2%29%29%29%2C+t+%3D
// +0+..+2*PI
settings.shape = function shapeSquare(theta) {
var thetaPrime = theta % (2 * Math.PI / 4);
return 1 / (Math.cos(thetaPrime) + Math.sin(thetaPrime));
};
break;
case 'triangle-forward':
// http://www.wolframalpha.com/input/?i=plot+r+%3D+1%2F%28cos%28mod+
// %28t%2C+2*PI%2F3%29%29%2Bsqrt%283%29sin%28mod+%28t%2C+2*PI%2F3%29
// %29%29%2C+t+%3D+0+..+2*PI
settings.shape = function shapeTriangle(theta) {
var thetaPrime = theta % (2 * Math.PI / 3);
return 1 / (Math.cos(thetaPrime) +
Math.sqrt(3) * Math.sin(thetaPrime));
};
break;
case 'triangle':
case 'triangle-upright':
settings.shape = function shapeTriangle(theta) {
var thetaPrime = (theta + Math.PI * 3 / 2) % (2 * Math.PI / 3);
return 1 / (Math.cos(thetaPrime) +
Math.sqrt(3) * Math.sin(thetaPrime));
};
break;
case 'pentagon':
settings.shape = function shapePentagon(theta) {
var thetaPrime = (theta + 0.955) % (2 * Math.PI / 5);
return 1 / (Math.cos(thetaPrime) +
0.726543 * Math.sin(thetaPrime));
};
break;
case 'star':
settings.shape = function shapeStar(theta) {
var thetaPrime = (theta + 0.955) % (2 * Math.PI / 10);
if ((theta + 0.955) % (2 * Math.PI / 5) - (2 * Math.PI / 10) >= 0) {
return 1 / (Math.cos((2 * Math.PI / 10) - thetaPrime) +
3.07768 * Math.sin((2 * Math.PI / 10) - thetaPrime));
} else {
return 1 / (Math.cos(thetaPrime) +
3.07768 * Math.sin(thetaPrime));
}
};
break;
}
}
/* Make sure gridSize is a whole number and is not smaller than 4px */
settings.gridSize = Math.max(Math.floor(settings.gridSize), 4);
/* shorthand */
var g = settings.gridSize;
var maskRectWidth = g - settings.maskGapWidth;
/* normalize rotation settings */
var rotationRange = Math.abs(settings.maxRotation - settings.minRotation);
var minRotation = Math.min(settings.maxRotation, settings.minRotation);
/* information/object available to all functions, set when start() */
var grid, // 2d array containing filling information
ngx, ngy, // width and height of the grid
center, // position of the center of the cloud
maxRadius;
/* timestamp for measuring each putWord() action */
var escapeTime;
/* function for getting the color of the text */
var getTextColor;
function random_hsl_color(min, max) {
return 'hsl(' +
(Math.random() * 360).toFixed() + ',' +
(Math.random() * 30 + 70).toFixed() + '%,' +
(Math.random() * (max - min) + min).toFixed() + '%)';
}
switch (settings.color) {
case 'random-dark':
getTextColor = function getRandomDarkColor() {
return random_hsl_color(10, 50);
};
break;
case 'random-light':
getTextColor = function getRandomLightColor() {
return random_hsl_color(50, 90);
};
break;
default:
if (typeof settings.color === 'function') {
getTextColor = settings.color;
}
break;
}
/* Interactive */
var interactive = false;
var infoGrid = [];
var hovered;
var getInfoGridFromMouseEvent = function getInfoGridFromMouseEvent(evt) {
var canvas = evt.currentTarget;
var rect = canvas.getBoundingClientRect();
var eventX = evt.clientX - rect.left;
var eventY = evt.clientY - rect.top;
var x = Math.floor(eventX * ((canvas.width / rect.width) || 1) / g);
var y = Math.floor(eventY * ((canvas.height / rect.height) || 1) / g);
return infoGrid[x][y];
};
var wordcloudhover = function wordcloudhover(evt) {
var info = getInfoGridFromMouseEvent(evt);
if (hovered === info) {
return;
}
hovered = info;
if (!info) {
settings.hover(undefined, undefined, evt);
return;
}
settings.hover(info.item, info.dimension, evt);
};
var wordcloudclick = function wordcloudclick(evt) {
var info = getInfoGridFromMouseEvent(evt);
if (!info) {
return;
}
settings.click(info.item, info.dimension, evt);
};
/* Get points on the grid for a given radius away from the center */
var pointsAtRadius = [];
var getPointsAtRadius = function getPointsAtRadius(radius) {
if (pointsAtRadius[radius]) {
return pointsAtRadius[radius];
}
// Look for these number of points on each radius
var T = radius * 8;
// Getting all the points at this radius
var t = T;
var points = [];
if (radius === 0) {
points.push([center[0], center[1], 0]);
}
while (t--) {
// distort the radius to put the cloud in shape
var rx = 1;
if (settings.shape !== 'circle') {
rx = settings.shape(t / T * 2 * Math.PI); // 0 to 1
}
// Push [x, y, t]; t is used solely for getTextColor()
points.push([
center[0] + radius * rx * Math.cos(-t / T * 2 * Math.PI),
center[1] + radius * rx * Math.sin(-t / T * 2 * Math.PI) *
settings.ellipticity,
t / T * 2 * Math.PI]);
}
pointsAtRadius[radius] = points;
return points;
};
/* Return true if we had spent too much time */
var exceedTime = function exceedTime() {
return ((settings.abortThreshold > 0) &&
((new Date()).getTime() - escapeTime > settings.abortThreshold));
};
/* Get the deg of rotation according to settings, and luck. */
var getRotateDeg = function getRotateDeg() {
if (settings.rotateRatio === 0) {
return 0;
}
if (Math.random() > settings.rotateRatio) {
return 0;
}
if (rotationRange === 0) {
return minRotation;
}
return minRotation + Math.random() * rotationRange;
};
var getTextInfo = function getTextInfo(word, weight, rotateDeg) {
// calculate the acutal font size
// fontSize === 0 means weightFactor function wants the text skipped,
// and size < minSize means we cannot draw the text.
var debug = false;
var fontSize = settings.weightFactor(weight);
if (fontSize <= settings.minSize) {
return false;
}
// Scale factor here is to make sure fillText is not limited by
// the minium font size set by browser.
// It will always be 1 or 2n.
var mu = 1;
if (fontSize < miniumFontSize) {
mu = (function calculateScaleFactor() {
var mu = 2;
while (mu * fontSize < miniumFontSize) {
mu += 2;
}
return mu;
})();
}
var fcanvas = document.createElement('canvas');
var fctx = fcanvas.getContext('2d', { willReadFrequently: true });
fctx.font = settings.fontWeight + ' ' +
(fontSize * mu).toString(10) + 'px ' + settings.fontFamily;
// Estimate the dimension of the text with measureText().
var fw = fctx.measureText(word).width / mu;
var fh = Math.max(fontSize * mu,
fctx.measureText('m').width,
fctx.measureText('\uFF37').width) / mu;
// Create a boundary box that is larger than our estimates,
// so text don't get cut of (it sill might)
var boxWidth = fw + fh * 2;
var boxHeight = fh * 3;
var fgw = Math.ceil(boxWidth / g);
var fgh = Math.ceil(boxHeight / g);
boxWidth = fgw * g;
boxHeight = fgh * g;
// Calculate the proper offsets to make the text centered at
// the preferred position.
// This is simply half of the width.
var fillTextOffsetX = - fw / 2;
// Instead of moving the box to the exact middle of the preferred
// position, for Y-offset we move 0.4 instead, so Latin alphabets look
// vertical centered.
var fillTextOffsetY = - fh * 0.4;
// Calculate the actual dimension of the canvas, considering the rotation.
var cgh = Math.ceil((boxWidth * Math.abs(Math.sin(rotateDeg)) +
boxHeight * Math.abs(Math.cos(rotateDeg))) / g);
var cgw = Math.ceil((boxWidth * Math.abs(Math.cos(rotateDeg)) +
boxHeight * Math.abs(Math.sin(rotateDeg))) / g);
var width = cgw * g;
var height = cgh * g;
fcanvas.setAttribute('width', width);
fcanvas.setAttribute('height', height);
if (debug) {
// Attach fcanvas to the DOM
document.body.appendChild(fcanvas);
// Save it's state so that we could restore and draw the grid correctly.
fctx.save();
}
// Scale the canvas with |mu|.
fctx.scale(1 / mu, 1 / mu);
fctx.translate(width * mu / 2, height * mu / 2);
fctx.rotate(- rotateDeg);
// Once the width/height is set, ctx info will be reset.
// Set it again here.
fctx.font = settings.fontWeight + ' ' +
(fontSize * mu).toString(10) + 'px ' + settings.fontFamily;
// Fill the text into the fcanvas.
// XXX: We cannot because textBaseline = 'top' here because
// Firefox and Chrome uses different default line-height for canvas.
// Please read https://bugzil.la/737852#c6.
// Here, we use textBaseline = 'middle' and draw the text at exactly
// 0.5 * fontSize lower.
fctx.fillStyle = '#000';
fctx.textBaseline = 'middle';
fctx.fillText(word, fillTextOffsetX * mu,
(fillTextOffsetY + fontSize * 0.5) * mu);
// Get the pixels of the text
var imageData = fctx.getImageData(0, 0, width, height).data;
if (exceedTime()) {
return false;
}
if (debug) {
// Draw the box of the original estimation
fctx.strokeRect(fillTextOffsetX * mu,
fillTextOffsetY, fw * mu, fh * mu);
fctx.restore();
}
// Read the pixels and save the information to the occupied array
var occupied = [];
var gx = cgw, gy, x, y;
var bounds = [cgh / 2, cgw / 2, cgh / 2, cgw / 2];
while (gx--) {
gy = cgh;
while (gy--) {
y = g;
singleGridLoop: {
while (y--) {
x = g;
while (x--) {
if (imageData[((gy * g + y) * width +
(gx * g + x)) * 4 + 3]) {
occupied.push([gx, gy]);
if (gx < bounds[3]) {
bounds[3] = gx;
}
if (gx > bounds[1]) {
bounds[1] = gx;
}
if (gy < bounds[0]) {
bounds[0] = gy;
}
if (gy > bounds[2]) {
bounds[2] = gy;
}
if (debug) {
fctx.fillStyle = 'rgba(255, 0, 0, 0.5)';
fctx.fillRect(gx * g, gy * g, g - 0.5, g - 0.5);
}
break singleGridLoop;
}
}
}
if (debug) {
fctx.fillStyle = 'rgba(0, 0, 255, 0.5)';
fctx.fillRect(gx * g, gy * g, g - 0.5, g - 0.5);
}
}
}
}
if (debug) {
fctx.fillStyle = 'rgba(0, 255, 0, 0.5)';
fctx.fillRect(bounds[3] * g,
bounds[0] * g,
(bounds[1] - bounds[3] + 1) * g,
(bounds[2] - bounds[0] + 1) * g);
}
// Return information needed to create the text on the real canvas
return {
mu: mu,
occupied: occupied,
bounds: bounds,
gw: cgw,
gh: cgh,
fillTextOffsetX: fillTextOffsetX,
fillTextOffsetY: fillTextOffsetY,
fillTextWidth: fw,
fillTextHeight: fh,
fontSize: fontSize
};
};
/* Determine if there is room available in the given dimension */
var canFitText = function canFitText(gx, gy, gw, gh, occupied) {
// Go through the occupied points,
// return false if the space is not available.
var i = occupied.length;
while (i--) {
var px = gx + occupied[i][0];
var py = gy + occupied[i][1];
if (px >= ngx || py >= ngy || px < 0 || py < 0 || !grid[px][py]) {
return false;
}
}
return true;
};
/* Actually draw the text on the grid */
var drawText = function drawText(gx, gy, info, word, weight,
distance, theta, rotateDeg, attributes) {
var fontSize = info.fontSize;
var color;
if (getTextColor) {
color = getTextColor(word, weight, fontSize, distance, theta);
} else {
color = settings.color;
}
var dimension;
var bounds = info.bounds;
dimension = {
x: (gx + bounds[3]) * g,
y: (gy + bounds[0]) * g,
w: (bounds[1] - bounds[3] + 1) * g,
h: (bounds[2] - bounds[0] + 1) * g
};
elements.forEach(function(el) {
if (el.getContext) {
var ctx = el.getContext('2d');
var mu = info.mu;
// Save the current state before messing it
ctx.save();
ctx.scale(1 / mu, 1 / mu);
ctx.font = settings.fontWeight + ' ' +
(fontSize * mu).toString(10) + 'px ' + settings.fontFamily;
ctx.fillStyle = color;
// Translate the canvas position to the origin coordinate of where
// the text should be put.
ctx.translate((gx + info.gw / 2) * g * mu,
(gy + info.gh / 2) * g * mu);
if (rotateDeg !== 0) {
ctx.rotate(- rotateDeg);
}
// Finally, fill the text.
// XXX: We cannot because textBaseline = 'top' here because
// Firefox and Chrome uses different default line-height for canvas.
// Please read https://bugzil.la/737852#c6.
// Here, we use textBaseline = 'middle' and draw the text at exactly
// 0.5 * fontSize lower.
ctx.textBaseline = 'middle';
ctx.fillText(word, info.fillTextOffsetX * mu,
(info.fillTextOffsetY + fontSize * 0.5) * mu);
// The below box is always matches how <span>s are positioned
/* ctx.strokeRect(info.fillTextOffsetX, info.fillTextOffsetY,
info.fillTextWidth, info.fillTextHeight); */
// Restore the state.
ctx.restore();
} else {
// drawText on DIV element
var span = document.createElement('span');
var transformRule = '';
transformRule = 'rotate(' + (- rotateDeg / Math.PI * 180) + 'deg) ';
if (info.mu !== 1) {
transformRule +=
'translateX(-' + (info.fillTextWidth / 4) + 'px) ' +
'scale(' + (1 / info.mu) + ')';
}
var styleRules = {
'position': 'absolute',
'display': 'block',
'font': settings.fontWeight + ' ' +
(fontSize * info.mu) + 'px ' + settings.fontFamily,
'left': ((gx + info.gw / 2) * g + info.fillTextOffsetX) + 'px',
'top': ((gy + info.gh / 2) * g + info.fillTextOffsetY) + 'px',
'width': info.fillTextWidth + 'px',
'height': info.fillTextHeight + 'px',
'color': color,
'lineHeight': fontSize + 'px',
'whiteSpace': 'nowrap',
'transform': transformRule,
'webkitTransform': transformRule,
'msTransform': transformRule,
'transformOrigin': '50% 40%',
'webkitTransformOrigin': '50% 40%',
'msTransformOrigin': '50% 40%'
};
span.textContent = word;
for (var cssProp in styleRules) {
span.style[cssProp] = styleRules[cssProp];
}
if (attributes) {
for (var attribute in attributes) {
span.setAttribute(attribute, attributes[attribute]);
}
}
el.appendChild(span);
}
});
};
/* Help function to updateGrid */
var fillGridAt = function fillGridAt(x, y, drawMask, dimension, item) {
if (x >= ngx || y >= ngy || x < 0 || y < 0) {
return;
}
grid[x][y] = false;
if (drawMask) {
var ctx = elements[0].getContext('2d');
ctx.fillRect(x * g, y * g, maskRectWidth, maskRectWidth);
}
if (interactive) {
infoGrid[x][y] = { item: item, dimension: dimension };
}
};
/* Update the filling information of the given space with occupied points.
Draw the mask on the canvas if necessary. */
var updateGrid = function updateGrid(gx, gy, gw, gh, info, item) {
var occupied = info.occupied;
var drawMask = settings.drawMask;
var ctx;
if (drawMask) {
ctx = elements[0].getContext('2d');
ctx.save();
ctx.fillStyle = settings.maskColor;
}
var dimension;
if (interactive) {
var bounds = info.bounds;
dimension = {
x: (gx + bounds[3]) * g,
y: (gy + bounds[0]) * g,
w: (bounds[1] - bounds[3] + 1) * g,
h: (bounds[2] - bounds[0] + 1) * g
};
}
var i = occupied.length;
while (i--) {
fillGridAt(gx + occupied[i][0], gy + occupied[i][1],
drawMask, dimension, item);
}
if (drawMask) {
ctx.restore();
}
};
/* putWord() processes each item on the list,
calculate it's size and determine it's position, and actually
put it on the canvas. */
var putWord = function putWord(item) {
var word, weight, attributes;
if (Array.isArray(item)) {
word = item[0];
weight = item[1];
} else {
word = item.word;
weight = item.weight;
attributes = item.attributes;
}
var rotateDeg = getRotateDeg();
// get info needed to put the text onto the canvas
var info = getTextInfo(word, weight, rotateDeg);
// not getting the info means we shouldn't be drawing this one.
if (!info) {
return false;
}
if (exceedTime()) {
return false;
}
// Skip the loop if we have already know the bounding box of
// word is larger than the canvas.
var bounds = info.bounds;
if ((bounds[1] - bounds[3] + 1) > ngx ||
(bounds[2] - bounds[0] + 1) > ngy) {
return false;
}
// Determine the position to put the text by
// start looking for the nearest points
var r = maxRadius + 1;
var tryToPutWordAtPoint = function(gxy) {
var gx = Math.floor(gxy[0] - info.gw / 2);
var gy = Math.floor(gxy[1] - info.gh / 2);
var gw = info.gw;
var gh = info.gh;
// If we cannot fit the text at this position, return false
// and go to the next position.
if (!canFitText(gx, gy, gw, gh, info.occupied)) {
return false;
}
// Actually put the text on the canvas
drawText(gx, gy, info, word, weight,
(maxRadius - r), gxy[2], rotateDeg, attributes);
// Mark the spaces on the grid as filled
updateGrid(gx, gy, gw, gh, info, item);
// Return true so some() will stop and also return true.
return true;
};
while (r--) {
var points = getPointsAtRadius(maxRadius - r);
if (settings.shuffle) {
points = [].concat(points);
shuffleArray(points);
}
// Try to fit the words by looking at each point.
// array.some() will stop and return true
// when putWordAtPoint() returns true.
// If all the points returns false, array.some() returns false.
var drawn = points.some(tryToPutWordAtPoint);
if (drawn) {
// leave putWord() and return true
return true;
}
}
// we tried all distances but text won't fit, return false
return false;
};
/* Send DOM event to all elements. Will stop sending event and return
if the previous one is canceled (for cancelable events). */
var sendEvent = function sendEvent(type, cancelable, detail) {
if (cancelable) {
return !elements.some(function(el) {
var evt = document.createEvent('CustomEvent');
evt.initCustomEvent(type, true, cancelable, detail || {});
return !el.dispatchEvent(evt);
}, this);
} else {
elements.forEach(function(el) {
var evt = document.createEvent('CustomEvent');
evt.initCustomEvent(type, true, cancelable, detail || {});
el.dispatchEvent(evt);
}, this);
}
};
/* Start drawing on a canvas */
var start = function start() {
// For dimensions, clearCanvas etc.,
// we only care about the first element.
var canvas = elements[0];
if (canvas.getContext) {
ngx = Math.floor(canvas.width / g);
ngy = Math.floor(canvas.height / g);
} else {
var rect = canvas.getBoundingClientRect();
ngx = Math.floor(rect.width / g);
ngy = Math.floor(rect.height / g);
}
// Sending a wordcloudstart event which cause the previous loop to stop.
// Do nothing if the event is canceled.
if (!sendEvent('wordcloudstart', true)) {
return;
}
// Determine the center of the word cloud
center = (settings.origin) ?
[settings.origin[0]/g, settings.origin[1]/g] :
[ngx / 2, ngy / 2];
// Maxium radius to look for space
maxRadius = Math.floor(Math.sqrt(ngx * ngx + ngy * ngy));
/* Clear the canvas only if the clearCanvas is set,
if not, update the grid to the current canvas state */
grid = [];
var gx, gy, i;
if (!canvas.getContext || settings.clearCanvas) {
elements.forEach(function(el) {
if (el.getContext) {
var ctx = el.getContext('2d');
ctx.fillStyle = settings.backgroundColor;
ctx.clearRect(0, 0, ngx * (g + 1), ngy * (g + 1));
ctx.fillRect(0, 0, ngx * (g + 1), ngy * (g + 1));
} else {
el.textContent = '';
el.style.backgroundColor = settings.backgroundColor;
}
});
/* fill the grid with empty state */
gx = ngx;
while (gx--) {
grid[gx] = [];
gy = ngy;
while (gy--) {
grid[gx][gy] = true;
}
}
} else {
/* Determine bgPixel by creating
another canvas and fill the specified background color. */
var bctx = document.createElement('canvas').getContext('2d');
bctx.fillStyle = settings.backgroundColor;
bctx.fillRect(0, 0, 1, 1);
var bgPixel = bctx.getImageData(0, 0, 1, 1).data;
/* Read back the pixels of the canvas we got to tell which part of the
canvas is empty.
(no clearCanvas only works with a canvas, not divs) */
var imageData =
canvas.getContext('2d').getImageData(0, 0, ngx * g, ngy * g).data;
gx = ngx;
var x, y;
while (gx--) {
grid[gx] = [];
gy = ngy;
while (gy--) {
y = g;
singleGridLoop: while (y--) {
x = g;
while (x--) {
i = 4;
while (i--) {
if (imageData[((gy * g + y) * ngx * g +
(gx * g + x)) * 4 + i] !== bgPixel[i]) {
grid[gx][gy] = false;
break singleGridLoop;
}
}
}
}
if (grid[gx][gy] !== false) {
grid[gx][gy] = true;
}
}
}
imageData = bctx = bgPixel = undefined;
}
// fill the infoGrid with empty state if we need it
if (settings.hover || settings.click) {
interactive = true;
/* fill the grid with empty state */
gx = ngx + 1;
while (gx--) {
infoGrid[gx] = [];
}
if (settings.hover) {
canvas.addEventListener('mousemove', wordcloudhover);
}
if (settings.click) {
canvas.addEventListener('click', wordcloudclick);
}
canvas.addEventListener('wordcloudstart', function stopInteraction() {
canvas.removeEventListener('wordcloudstart', stopInteraction);
canvas.removeEventListener('mousemove', wordcloudhover);
canvas.removeEventListener('click', wordcloudclick);
hovered = undefined;
});
}
i = 0;
var loopingFunction, stoppingFunction;
if (settings.wait !== 0) {
loopingFunction = window.setTimeout;
stoppingFunction = window.clearTimeout;
} else {
loopingFunction = window.setImmediate;
stoppingFunction = window.clearImmediate;
}
var addEventListener = function addEventListener(type, listener) {
elements.forEach(function(el) {
el.addEventListener(type, listener);
}, this);
};
var removeEventListener = function removeEventListener(type, listener) {
elements.forEach(function(el) {
el.removeEventListener(type, listener);
}, this);
};
var anotherWordCloudStart = function anotherWordCloudStart() {
removeEventListener('wordcloudstart', anotherWordCloudStart);
stoppingFunction(timer);
};
addEventListener('wordcloudstart', anotherWordCloudStart);
var timer = loopingFunction(function loop() {
if (i >= settings.list.length) {
stoppingFunction(timer);
sendEvent('wordcloudstop', false);
removeEventListener('wordcloudstart', anotherWordCloudStart);
return;
}
escapeTime = (new Date()).getTime();
var drawn = putWord(settings.list[i]);
var canceled = !sendEvent('wordclouddrawn', true, {
item: settings.list[i], drawn: drawn });
if (exceedTime() || canceled) {
stoppingFunction(timer);
settings.abort();
sendEvent('wordcloudabort', false);
sendEvent('wordcloudstop', false);
removeEventListener('wordcloudstart', anotherWordCloudStart);
return;
}
i++;
timer = loopingFunction(loop, settings.wait);
}, settings.wait);
};
// All set, start the drawing
start();
};
WordCloud.isSupported = isSupported;
WordCloud.miniumFontSize = miniumFontSize;
// Expose the library as an AMD module
if (typeof global.define === 'function' && global.define.amd) {
global.define('wordcloud', [], function() { return WordCloud; });
} else if (typeof global.module !== 'undefined' && global.module.exports) {
global.module.exports = WordCloud;
} else {
global.WordCloud = WordCloud;
}
})(window);